Get Max health
Go to the cheats screen at the options menu and put in X, X, Square, Triangle, Square, Triangle, Circle

Get Crazy Deaths
Go to the cheats screen at the options menu and put in Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle

Get Rain of Fire
Go to the cheats screen at the options menu and put in Square, Square, Square, Square, Square, Square, Square, Square

Get Rapid Rails
Go to the cheats screen at the options menu and put in Circle, Square, Circle, Square, X, X, Triangle, Triangle

Get Director's Cut
Go to the cheats screen at the options menu and put in Square, X, Circle, Triangle, Circle, X, Square, Triangle

Get Fat mode
Go to the cheats screen at the options menu and put in Circle, Circle, Circle, Circle, Triangle, X, Circle, Circle

Get Gibby Explosions
Go to the cheats screen at the options menu and put in Triangle, Circle, X, Square, Triangle, Circle, X, Square

Get Unlimited Ammo
Go to the cheats screen at the options menu and put in Square, Triangle, X, Circle, Square, Circle, X, Triangle

Get A Joke
Go to the cheats screen at the options menu and put in Square, X, Square, X, Square, X, Square, X

Get Walking Dead
Go to the cheats screen at the options menu and put in X, X, X, X, X, X, X, X

Get Exploding personality Cheat
Go to the cheats screen at the options menu and put in X

Throw Gernades Rapidly
First If you want to throw grenades rapidly grab a frag, satchel, incendiary, shock. then have at least two weapons then press your grenade throwing button press Square or circle keep pressing R1 rapidly if you do it correctly you should see plenty of grenades on the floor. P.S. also works on 1 player story mode.

FMV sequences:
After clearing a level, you will be awarded the FMV sequence for that level plus another movie. Completing level 1 unlocks a spoof interview with characters from Summoner 2 talking about the Red Faction games. Completing level 2 unlocks a behind-the-scenes FMV sequence.

Rapid kills, accuracy, and bagman points:
Select "Team Bagman" and go to the level "Relentless". Set the options as follows:

Weapons: Pistol to default, rail driver
Score limits: 500
More bots possible
No power ups
No reloads
Unlimited ammo
Difficulty: Easy or create some bots and make them easier and make their first
liked weapon to pistol.
Have yourself alone in your team, and all bots are in the other.

Try to find the rail driver and the bag then go to the large room where is the large hole on the roof. Go to the little room on your left when you come from the little jump room. Next, stay as hidden as possible. The stupid bots will appear. Keep firing so that when the bots appear, they will freeze in place and cannot hit you. If you wait until at least four bots are stuck like that, you will have unbelievable performance.

Funny message in multi-player mode:
In the multi-player level "Watch Your Step", jump off of a cliff and fall. If you look upward quick enough, you will be able to see a hidden message spray painted on the bottom of the level. The message is "SUCKS TO BE YOU". An easier way to do this is to play on arena mode and die to become an observer. While in observer mode, move under the platform and read the message.